| 塔里木盆地区域地下水环境同位素特征及其意义 |
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| 引用本文： | 李文鹏,郝爱兵,郑跃军,刘斌,于德胜.塔里木盆地区域地下水环境同位素特征及其意义[J].地学前缘,2006,13(1):191-198. |
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| 作者姓名： | 李文鹏 郝爱兵 郑跃军 刘斌 于德胜 |
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| 作者单位： | 1. 中国地质环境监测院,北京,100081
2. 新疆地质调查院,新疆,乌鲁木齐,830000 |
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| 基金项目： | 地质调查局地质调查项目;国家自然科学基金 |
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| 摘 要： | 以大量水环境同位素样品测试结果为依据,对塔里木盆地的区域水环境同位素特征进行了分析,得出了一些有意义的认识:(1)塔里木盆地不同14C年龄的地下水的δD、δ18O值差异不明显,反映了水资源形成区在最后冰期和冰后期气温相差不大,推测是由于新构造运动使山体隆升,同一位置因高程变化产生的气温变化弥合了气候的变化,这一特征使我们难以运用δD-δ18O关系区别古水(冰期)与现代水(冰后期)。(2)在δD-δ18O关系图上,沿大气降水线可把盆地内主要河流及其补给形成的地下水大致圈定在3个域内,这3个域的区别不是大气环流作用的结果,而是河流源区山脉高程效应的反映。(3)与西北内陆盆地其他大型河流比较,阿克苏河流域下游承压自流水的14C年龄小得多,这是由阿克苏河径流量大、下游为河槽洼地、不完全具备山前倾斜平原水文地质特征等决定的。阿克苏河下游承压水水循环交替迅速,开发潜力较大,在西北内流盆地中是一个特例。(4)塔克拉玛干沙漠第四系松散层地下水主要是从盆地南缘侧向补给的,在沙漠腹地由深部向浅部顶托排泄。盆地内深层油田水处于高度封闭的滞留状态,与上部松散沉积层地下水之间基本没有联系。
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| 关 键 词： | 塔里木盆地 环境同位素 地下水 |
| 文章编号： | 1005-2321（2006）01-0191-08 |
| 收稿时间： | 2005-12-19 |
| 修稿时间： | 2005年12月19 |
Regional environmental isotopic features of groundwater and their hydrogeological explanation in the Tarim Basin |
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| LI Wen-peng,HAO Ai-bing,ZHENG Yue-jun,LIU Bin,YU De-sheng.Regional environmental isotopic features of groundwater and their hydrogeological explanation in the Tarim Basin[J].Earth Science Frontiers,2006,13(1):191-198. |
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| Authors: | LI Wen-peng HAO Ai-bing ZHENG Yue-jun LIU Bin YU De-sheng |
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| Institution: | 1. China Institute for Geo-Environmental Monitoring, Beij ing 100081, China; 2. Xinjiang Geological Survey, Uriimqi 830000, China |
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| Abstract: | Based on measurements of a large number of water samples from the Tarim Basin, some regional environmental isotopic characteristics of different water bodies have been identified. These hydrogeological characteristics allow the following conclusions: (1) there are no obvious δD-δ~18KG-*9]O differences for groundwater with different ~14KG-*9]C ages. This means that temperature changes in river source areas were not notable in the last 10 000 years, as compared with the last ice age. The reason for this phenomena may be that temperature change was counteracted by the tectonic uplifting of the river source areas. This suggests difficulties in using δD and δ~18KG-*9]O to identify groundwater recharged at different times; (2) on the δD-δ~KG-*9]18O plot, three domains can be identified for all samples along the Global Meteoric Water Line (GMWL). The δD and δ~18KG-*9]O differences for the three domains reflects altitude difference instead of the atmospheric circulation; (3) compared with other inland river basins in northwest China, the ~14KG-*9]C age of confined groundwater in the Aksu River catchments is distinctly and represents a special case. This results from the special hydrogeological setting where the bedrock under the river plain occurs as a narrow valley; (4) it is concluded from the δD-δ~18KG-*9]O plot for all water samples that groundwater stored in Quaternary deposit in the Taklimakan Desert is mainly recharged laterally from the south and flows from deep to shallow vertically. There are no hydraulic links between deep oil field water and the groundwater in Quaternary deposit. The deep oil field water is characterized by stagnant flow. |
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| Keywords: | Tarim Basin environmental isotopic groundwater |
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